Television apparatus



March 3, 1942. A. MORCH ETAL 2,275,229

TELEVISION APPARATUS Filed May 22, 1940 Fig. 1

Ami/2012 y Mari/1 Ja/m Marc/2 IN VEN TOR.

Patented Mar. 3, 1942 UNITED STATES PATENT OFFICE TELEVISION APPARATUSAnthony Merck and John Morch, Jamaica, N. Y.

Application May 22, 1940, Serial No. 336,665

1 Claim.

The invention relates to improvements in television apparatus generallyand more particularly to certain of the instrumentalities'employed inimage reception and display.

In television receivers now available to the general public,particularly those for use in private .homes, there are certaindisadvantages and disquieting faults present which are due, primarily,to the more or less embryonic development of the art and to the need ofthe manufacturer to produce receivers with a price range that willquickly create a fairly wide market for them. In these receivers, thereceived images are usually to be viewed through a framed opening orWindow in the front wall of a cabinet direct from the image screen ofthe cathode-ray receiving tube, with the result that the image is muchtoo small for clear and easy observation and, more often than not, Willappear obscure and distorted, due to the small size of the receivingtube employed; the image screen of which usually having an effectiveimage area of less than five inches in height and width.

It is therefore among the several objects of the invention to provide amethod and means, that will be effective in reducing, if not entirelyovercoming, the aforesaid disadvantages and faults, without addingappreciably to the manufacturing costs of television receiver sets inwhich the disclosed improvements are incorporated.

Another of the objects of the invention is to effectively increase thevisibility of received images and to eliminate distortion andobs'cureness therefrom, by enlarging the received image withoutcorrespondingly increasing the size of the cathode-ray receiving tubeusually employed.

Still another object of the invention has to do with the provision of ameans for effectively enlarging the image received on the screen of acathode-ray receiving tube by effecting a transfer of the image from thetube screen to a viewing screen of a proportionately larger area,without employing a projecting media for the purpose.

With these and other objects and advantages of equal importance in view,the invention resides in the certain new and useful combinations,constructions, and arrangements, that will be hereinafter more fullydescribed, set forth in the appended claim, and illustrated in theaccompanying drawing, in which:

Figure 1 is a vertical section through a conventional televisionreceiver cabinet, showing a cathode-ray receiving tube assembly therein,in accordance with the instant invention;

Figure 2 is an enlarged vertical longitudinal section through thecathode-ray receiving tube assembly as in Figure 1; and

Figure 3 is a vertical transverse section taken on the line 3-3 ofFigure 2.

Referring to the drawing, wherein like characters of reference designatecorresponding parts in the related views thereof, and more particularlyto Figures 1 to 3, inclusive, I denotes the evacuated envelope of acathode ray receiving tube which has a usual multi-pronged connector atits smaller end for engagement with a companion connector Ia forming theterminal of a suitable electric current supply. The tube I is mountedfor endwise movement at the upper end of a support 5a rising from thebottom wall of a television receiver cabinet -5, for the focusingadjustment of the image screen Ib, forming the end wall of itslargerend, relatively to the image viewing opening or window in the front wallof the cabinet 5.

In accordance with the present invention, with a cathode-ray receivingtube having a five inch image receiving screen forming its larger endwall, the viewing opening or window in the front wall of the cabinet 5will be made to a size to receive an observation lens or screen 6, forinstance, one foot square. This lens or screen 6 is preferably convex inform and will be framed within the opening or window and mounted in thelarger end of an inwardly tapering housing part 3 that is telescopicallyengaged by .a similarly tapered part 2 which is carried by thecathoderay receiving tube I in a manner to enclose the larger endportion thereof. A clamp means 4 is positioned on the smaller endportion of the tube I and engages the smaller end of the telescopichousing part 2 to hold it in fixed position. Thus, by adjusting the tubeI on the support 5a, the image screen I a thereof may be readily broughtinto focus relatively to the enlarging lens or screen 6, as will beobvious. Also, the housing part 2 is adjustable relatively to the tube Iby loosening up on holding screws 4a carried by the clamp means 4, whichadjustment admits of the positioning of the same and the tube for properand efiicient cooperation with the lens screen 6.

In this instance of the invention, the wall at the larger end of thecathode-ray receiving tube I is preferably made substantially fiat andof plain clear glass, with its inner surface provided with a coating ofany suitable or usual fluorescent materials, as at Id, necessary for thereproduction thereon of an image by the electronic beam or the tube. Theimage on the screen Id will be transferred through the telescopichousing for viewing at the front of the enlarging lens screen I and, asa consequence of the proportionately greater area of the latter, theimage will be to be understood that it is subject to modification andminor changes in detail of construction and arrangement of parts,without departing from the spirit of invention or the scope thereof asclaimed.

What we claim, is:

The combination with a radio receiver cabinet having a sight opening forexposure of television images therethrough, an enlarging lens closingsaid sight opening, an open-ended housing extending within said cabinetfrom about said sight opening and said lens, said housing beingconstituted in complementally tapered sections adapted for lengthadjustment telescopically, a support within said cabinet, and acathode-ray receiver tube movably mounted on said support and having itslarger end enclosed within the free end of the smaller movable sectionof said housing, said receiver tube being adjustable on said support andrelatively to and with said smaller housing section to position theimage screen of the receiver tube in optical focus with 20 said lens.

ANTHONY MORCH. JOHN MORCH.

